==================================================================
BUG: KASAN: use-after-free in roccat_disconnect+0x22d/0x240 drivers/hid/hid-roccat.c:382
Read of size 4 at addr ffff88810b2f4008 by task kworker/0:0/5

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x100/0x140 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 roccat_disconnect+0x22d/0x240 drivers/hid/hid-roccat.c:382
 savu_remove_specials drivers/hid/hid-roccat-savu.c:107 [inline]
 savu_remove+0xec/0x170 drivers/hid/hid-roccat-savu.c:147
 hid_device_remove+0xba/0x170 drivers/hid/hid-core.c:2392
 __device_release_driver drivers/base/dd.c:-1 [inline]
 device_release_driver_internal+0x531/0x7c0 drivers/base/dd.c:1221
 device_release_driver+0x19/0x20 drivers/base/dd.c:1244
 bus_remove_device+0x2df/0x340 drivers/base/bus.c:535
 device_del+0x62e/0xe60 drivers/base/core.c:3453
 hid_remove_device drivers/hid/hid-core.c:2563 [inline]
 hid_destroy_device+0x6a/0x110 drivers/hid/hid-core.c:2582
 usbhid_disconnect+0x9f/0xc0 drivers/hid/usbhid/hid-core.c:1463
 usb_unbind_interface+0x212/0x8a0 drivers/usb/core/driver.c:459
 __device_release_driver drivers/base/dd.c:-1 [inline]
 device_release_driver_internal+0x531/0x7c0 drivers/base/dd.c:1221
 device_release_driver+0x19/0x20 drivers/base/dd.c:1244
 bus_remove_device+0x2df/0x340 drivers/base/bus.c:535
 device_del+0x62e/0xe60 drivers/base/core.c:3453
 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1470
 usb_disconnect+0x32d/0x870 drivers/usb/core/hub.c:2315
 hub_port_connect drivers/usb/core/hub.c:5343 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5644 [inline]
 port_event drivers/usb/core/hub.c:5810 [inline]
 hub_event+0x19c2/0x4220 drivers/usb/core/hub.c:5892
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Allocated by task 308:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 ____kasan_kmalloc mm/kasan/common.c:509 [inline]
 __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518
 kasan_kmalloc include/linux/kasan.h:254 [inline]
 kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:667 [inline]
 roccat_connect+0x5c/0x4b0 drivers/hid/hid-roccat.c:315
 savu_init_specials drivers/hid/hid-roccat-savu.c:81 [inline]
 savu_probe+0x1ba/0x360 drivers/hid/hid-roccat-savu.c:131
 hid_device_probe+0x28d/0x390 drivers/hid/hid-core.c:2363
 really_probe+0x373/0xa60 drivers/base/dd.c:558
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 hid_add_device+0x349/0x4b0 drivers/hid/hid-core.c:2515
 usbhid_probe+0xb93/0xf30 drivers/hid/usbhid/hid-core.c:1436
 usb_probe_interface+0x60f/0xb20 drivers/usb/core/driver.c:397
 really_probe+0x3bf/0xa60 drivers/base/dd.c:562
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 usb_set_configuration+0x1a76/0x1fe0 drivers/usb/core/message.c:2219
 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238
 usb_probe_device+0x143/0x250 drivers/usb/core/driver.c:294
 really_probe+0x3bf/0xa60 drivers/base/dd.c:562
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 usb_new_device+0x9ba/0x1460 drivers/usb/core/hub.c:2659
 hub_port_connect drivers/usb/core/hub.c:5504 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5644 [inline]
 port_event drivers/usb/core/hub.c:5810 [inline]
 hub_event+0x2790/0x4220 drivers/usb/core/hub.c:5892
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Freed by task 392:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kfree+0xc0/0x270 mm/slub.c:4196
 roccat_free_device+0x27b/0x280 drivers/hid/hid-roccat.c:79
 roccat_release+0x2ae/0x370 drivers/hid/hid-roccat.c:238
 __fput+0x2dc/0x730 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa7c/0x24e0 kernel/exit.c:879
 do_group_exit+0x149/0x310 kernel/exit.c:993
 __do_sys_exit_group kernel/exit.c:1004 [inline]
 __se_sys_exit_group kernel/exit.c:1002 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1002
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu kernel/rcu/tree.c:2980 [inline]
 call_rcu+0x11a/0x1090 kernel/rcu/tree.c:3054
 blkg_release+0x23/0x30 block/blk-cgroup.c:114
 percpu_ref_put_many include/linux/percpu-refcount.h:322 [inline]
 percpu_ref_put include/linux/percpu-refcount.h:338 [inline]
 percpu_ref_call_confirm_rcu lib/percpu-refcount.c:163 [inline]
 percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 lib/percpu-refcount.c:200
 rcu_do_batch+0x488/0xaf0 kernel/rcu/tree.c:2494
 rcu_core+0x50a/0xca0 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x255/0x563 kernel/softirq.c:309

The buggy address belongs to the object at ffff88810b2f4000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes inside of
 512-byte region [ffff88810b2f4000, ffff88810b2f4200)
The buggy address belongs to the page:
page:ffffea00042cbd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b2f4
head:ffffea00042cbd00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 1908977157, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x176/0x190 mm/page_alloc.c:2462
 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc_trace+0x1a8/0x2e0 mm/slub.c:2977
 kmem_cache_alloc_node_trace include/linux/slab.h:443 [inline]
 kmalloc_node include/linux/slab.h:573 [inline]
 kzalloc_node include/linux/slab.h:678 [inline]
 blkg_alloc+0x6d/0x570 block/blk-cgroup.c:158
 blkcg_init_queue+0x2d/0x330 block/blk-cgroup.c:1171
 blk_alloc_queue+0x444/0x5f0 block/blk-core.c:575
 blk_mq_init_queue_data block/blk-mq.c:3171 [inline]
 blk_mq_init_queue+0x37/0xd0 block/blk-mq.c:3190
 scsi_mq_alloc_queue+0x42/0x140 drivers/scsi/scsi_lib.c:1913
 scsi_alloc_sdev+0x611/0x920 drivers/scsi/scsi_scan.c:284
 scsi_probe_and_add_lun+0x17d/0x3370 drivers/scsi/scsi_scan.c:1098
 __scsi_scan_target+0x1d2/0xbf0 drivers/scsi/scsi_scan.c:1581
 scsi_scan_channel drivers/scsi/scsi_scan.c:1669 [inline]
 scsi_scan_host_selected+0x34e/0x600 drivers/scsi/scsi_scan.c:1698
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810b2f3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810b2f3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810b2f4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff88810b2f4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810b2f4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
usb 2-1: new high-speed USB device number 10 using dummy_hcd
usb 2-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 2-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0
usb 2-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00
usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 2-1: config 0 descriptor??
savu 0003:1E7D:2D5A.0029: hidraw0: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.1-1/input0
usb 1-1: USB disconnect, device number 10
usb 1-1: new high-speed USB device number 11 using dummy_hcd
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0
usb 1-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
savu 0003:1E7D:2D5A.0032: hidraw4: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.0-1/input0
usb 4-1: USB disconnect, device number 11
usb 4-1: new high-speed USB device number 12 using dummy_hcd
usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0
usb 4-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00
usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 4-1: config 0 descriptor??
savu 0003:1E7D:2D5A.0036: hidraw3: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.3-1/input0
usb 5-1: USB disconnect, device number 12
usb 5-1: new high-speed USB device number 13 using dummy_hcd
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0
usb 5-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00
usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 5-1: config 0 descriptor??
savu 0003:1E7D:2D5A.003C: hidraw1: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.4-1/input0
usb 5-1: USB disconnect, device number 13
usb 5-1: new high-speed USB device number 14 using dummy_hcd
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0
usb 5-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00
usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 5-1: config 0 descriptor??
savu 0003:1E7D:2D5A.0040: hidraw3: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.4-1/input0
usb 1-1: USB disconnect, device number 14
usb 1-1: new high-speed USB device number 15 using dummy_hcd
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0
usb 1-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??